The invention discloses a drum brake device which is characterized in that a first positioning pin and a second positioning pin are embedded in the inner side of a chassis, a mounting hole in clearance fit with the first positioning pin is formed in one end of a first brake shoe, and a mounting hole in clearance fit with the second positioning pin is formed in one end of a second brake shoe; a central rotating shaft is rotationally installed in the center of the chassis and connected with a pull rod, the central rotating shaft is fixedly sleeved with the central portion of a large driving arm,and the two ends of the large driving arm are connected with the brake shoes through small arms respectively. During braking, the pull rod drives the central rotating shaft to rotate; the central rotating shaft drives the driving big arm; a certain movable gap is reserved between the brake shoes and the positioning pins so that under the action of friction force, the brake drum can drive the twobrake shoes to move by a certain distance in the forward rotation direction of the wheel, the included angle between the small arms and the large driving arms is increased, the two brake shoes are enabled to be further expanded, and a user can obtain a large brake effect under the condition of consuming small acting force.

    本发明公开了一种鼓式刹车装置,在底盘的内侧嵌装有第一定位销和第二定位销,第一制动蹄的一端设置有用于与第一定位销间隙配合的安装孔,在第二制动蹄的一端设置有用于与第二定位销间隙配合的安装孔;中心转轴转动安装在底盘的中心位置,中心转轴与拉杆连接,驱动大臂的中心部位固定套装在中心转轴上,驱动大臂两端分别通过小臂与制动蹄连接。刹车时,拉杆带动中心转轴转动,中心转轴带动驱动大臂,由于制动蹄和定位销之间留有一定的活动间隙,因此在摩擦力作用下刹车鼓能够带动两制动蹄沿车轮正向旋转方向运动一定距离,使小臂和驱动大臂之间的夹角变大,促使两制动蹄进一步涨开,从而使用者在花费较小作用力的情况下能够获得较大的刹车效果。


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    Title :

    Drum brake device


    Additional title:

    一种鼓式刹车装置


    Contributors:
    ZHU QINGHUA (author)

    Publication date :

    2020-10-02


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    B62L BRAKES SPECIALLY ADAPTED FOR CYCLES , Bremsen, besonders für Fahrräder oder Motorräder ausgebildet



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